The effect of fatigue on jump height and vertical ground reaction force in landing after a spike on the net of professional volleyball players
Poster Presentation
Paper ID : 1554-SSRC
Authors
1دانشگاه آزاد همدان
2گروه بیومکانیک ورزشی، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران.
3Biomechanics
Abstract
Abstract
Objective: The purpose of the present study was to investigate the effect of fatigue on jump height and vertical ground reaction force in landing after a spike on the net of professional volleyball players.
Methods: 28 professional volleyball players present in Iranian leagues (mass 76.14 ± 9.09 kg, height 1.81 ± 0.15 m, BMI 23.71 ± 7.27) participated in this research as a statistical sample. 28 professional volleyball players present in Iranian leagues (mass 14.14 ± 9.09 kg, height 1.81 ± 0.15 m, BMI 27.7 ± 71.23) participated in this research as a statistical sample. A motion analysis system with four Vicon cameras (Oxford Metrics, Oxford, UK) was used to record lower limb kinematic data (100 Hz sampling frequency) and Concurrently, kinetic data registration involved the use of two Kistler force plates (Type 9281, Kistler Instrument AG, Winterthur, Switzerland) synchronized with the cameras, sampling data at a frequency of 1000 Hz. Subsequent analysis of both kinematic and kinetic data was performed using Nexus 1.8.5 software (Vicon Motion Systems, Ltd., UK) and Polygon 4.3 (Vicon Motion Systems, Oxford, UK). In this research, the jump height and vertical ground reaction force in the spike on the net task were measured before and after fatigue.
Results: Jumping height after fatigue was 14% lower than before fatigue and there was no significant difference between before and after fatigue in the vertical ground reaction force variable (P > 0.05).
Conclusion: Considering the effect of jump height on the variable of vertical ground reaction force, it was expected that after fatigue, the amount of GRF force would decrease due to a 14% decrease in jump height, but the results showed a significant difference between before and after fatigue in This variable does not exist. These results may be due to the effect of fatigue on the landing strategy, which means that after the imposing fatigue, the weight control during landing was disturbed. Therefore, the fatigue component should be taken into account when selecting people for the post spike on the net, and it is recommended to emphasize this point in training as well.
Objective: The purpose of the present study was to investigate the effect of fatigue on jump height and vertical ground reaction force in landing after a spike on the net of professional volleyball players.
Methods: 28 professional volleyball players present in Iranian leagues (mass 76.14 ± 9.09 kg, height 1.81 ± 0.15 m, BMI 23.71 ± 7.27) participated in this research as a statistical sample. 28 professional volleyball players present in Iranian leagues (mass 14.14 ± 9.09 kg, height 1.81 ± 0.15 m, BMI 27.7 ± 71.23) participated in this research as a statistical sample. A motion analysis system with four Vicon cameras (Oxford Metrics, Oxford, UK) was used to record lower limb kinematic data (100 Hz sampling frequency) and Concurrently, kinetic data registration involved the use of two Kistler force plates (Type 9281, Kistler Instrument AG, Winterthur, Switzerland) synchronized with the cameras, sampling data at a frequency of 1000 Hz. Subsequent analysis of both kinematic and kinetic data was performed using Nexus 1.8.5 software (Vicon Motion Systems, Ltd., UK) and Polygon 4.3 (Vicon Motion Systems, Oxford, UK). In this research, the jump height and vertical ground reaction force in the spike on the net task were measured before and after fatigue.
Results: Jumping height after fatigue was 14% lower than before fatigue and there was no significant difference between before and after fatigue in the vertical ground reaction force variable (P > 0.05).
Conclusion: Considering the effect of jump height on the variable of vertical ground reaction force, it was expected that after fatigue, the amount of GRF force would decrease due to a 14% decrease in jump height, but the results showed a significant difference between before and after fatigue in This variable does not exist. These results may be due to the effect of fatigue on the landing strategy, which means that after the imposing fatigue, the weight control during landing was disturbed. Therefore, the fatigue component should be taken into account when selecting people for the post spike on the net, and it is recommended to emphasize this point in training as well.
Keywords